8o 
SCENERY OF SWITZERLAND. 
The structure of the rocks affords no conclusive 
evidence. They agree no doubt in general character. 
The Gneiss of the Aar Massif is very similar to that 
of the St. Gotthard Hospice. The Protogine also 
repeats itself That of the St. Gotthard Massif in 
places resembles that of Mont Blanc. 
On the other hand, the fundamental rocks are 
very similar all over the world. Moreover, under- 
lying this similarity there are considerable differences 
in detail. 
These differences may be in many cases due to 
mechanical causes — those, for instance, between the 
St. Gotthard and the Adula, perhaps to the fact of 
the former being more compressed. It seems clear, 
however, that the rocks in each differ as much as 
those between different “massives.” 
Moreover, as the rocks included in the folds be- 
tween the massives are of the same age, we can 
hardly doubt that this applies to the massives them- 
selves. Here also the analogy of the Jura is very 
instructive. The bosses there are not on so grand a 
scale, they are not formed of such ancient rocks, and 
they are not so far denuded; but they are clearly 
parts of a system, and I cannot doubt that the same 
is the case with the great massives of the central 
Swiss chain. 
